Bluetooth Transmission Power Control for Wi-Fi Coexistence
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Solution Overview
Problem
When multiple wireless transmission technologies coexist in the same band, they can interfere with each other, leading to degraded throughput or link disconnection, particularly due to insufficient isolation between Bluetooth and Wi-Fi signals using the 2.4 G ISM band.
Innovation Solution
A method and electronic device that determine the overlapping level between channels used by different wireless modules and adjust the transmission power of one module based on this overlap to minimize interference, using thresholds for traffic and distance to set power levels, ensuring effective coexistence of Bluetooth and Wi-Fi technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If Bluetooth and Wi-Fi coexist in the 2.4G ISM band with small antenna isolation, then both wireless technologies can be used simultaneously, but signal interference occurs leading to degraded throughput or link disconnection
Solution Approach 1:
The patent implements dynamic transmission power adjustment for Bluetooth based on Wi-Fi activity detection. The system continuously monitors Wi-Fi transmission states and adaptively changes Bluetooth power levels in real-time, transitioning between different power modes depending on the presence and intensity of Wi-Fi signals, thereby resolving the interference issue while maintaining both technologies' functionality
Solution Approach 2:
The patent changes the transmission power parameter of Bluetooth dynamically based on Wi-Fi channel occupancy. By adjusting the power level parameter according to detected Wi-Fi activity, the system optimizes coexistence by reducing Bluetooth power when Wi-Fi is active and increasing it when Wi-Fi is absent, thus preventing interference while maintaining connectivity
2Reliability
If transmission power of Bluetooth is increased to maintain link stability, then link disconnection is reduced, but interference with Wi-Fi signal increases
Solution Approach 1:
The patent employs a feedback mechanism where the system continuously monitors Wi-Fi transmission activity and uses this information to adjust Bluetooth power levels. The feedback loop detects Wi-Fi signal presence and intensity, then responds by appropriately modifying Bluetooth transmission power to prevent interference while maintaining link stability, creating a closed-loop control system for optimal coexistence
3Object-generated harmful factors
If transmission power of Bluetooth is decreased to reduce Wi-Fi interference, then signal collision is minimized, but link stability deteriorates
Solution Approach 1:
The system dynamically adjusts Bluetooth transmission power based on real-time Wi-Fi activity detection rather than using a fixed low power level. When Wi-Fi is detected as inactive, Bluetooth power is increased to maintain link stability; when Wi-Fi is active, power is reduced to minimize interference. This dynamic adaptation resolves the contradiction by making power levels context-dependent
Data Source
AI summary
A method and an electronic device for controlling transmission power are provided. The method includes the steps of determining an overlapping level between a channel used by a first wireless module and a channel mask used by a second wireless module; determining whether to adjust the transmission power of the first wireless module according to the overlapping level, wherein the first wireless module complies with a first wireless technology, and the second wireless module complies with a second wireless technology, and the second wireless module is coexistent with the first wireless transmission technology in an overlapping hand.